Metal-bo ring machine



(No ModeL) v .TAT MBT ORING EINE.

.Na 441,204. Paten-ted Nov.' 25, 1890.

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UNITED STATES ATENT Fries.

AVA TATEM, OF NORFOLK, VIRGINIA.

METAL-BORING MACHINE.'

SPECIFICATION forming part of Letters Patent No. 441,204, dated November25, 189C. Application filed September l0, 1890. Serial No. 364,539. (Nomodel.)

To a/ZZ whom, t may concern.-

Be it known that I, AVA TATEM, a citizen of the United States, residingat Norfolk, in the county of Norfolk and State of Virginia, haveinvented certain new and useful Improvements in Metal-Boring Machines;and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part of this specification, and to the letters of referencemarked thereon.

Figure 1 of the drawings represents an elevation of my invention; Fig.2, asimilar view, partly in section; Fig. 3, an end view thereof.

The present invention has relation to that class'of metal-boringmachines adapted for heavy work, such as large pulleys, propellerwheels,and other parts of heavy machinery; and the object thereof is to improvethis class of boring-machines in the several details of construction,whereby it will more effectually and perfectly do its work, the cutterbeing automatic in its feeding action, and provision being made for anicety of adjustment of the boring-shaft from a perpendicular to therequired angle necessary to give the desiredtaper to the hole to bebored. These several objects I attain by the construction substantiallyas shown in the drawings, and hereinafter described and claimed.

In the accompanying drawings, A represents a boring-shaft of 4anypreferred diameter and length, and has a longitudinal groove c toreceive the screw-rod B, which feeds the cutter downward at everyquarter-revolution of the shaft, as will be hereinafter described. Thisscrew-rod B has its end b made iiat or of such shape as to engage withthe pinion O, which pinion engages with the teeth on a pinion D, whichin turn engages a pinion E. This last-mentioned pinion, carrying atripwheel F, is mounted on a shaft h', which extends through a bracketG, rigidly connected to the shaft by set-screw c or by any otherpreferred and well-known means, so that when the shaft A turns thebracket will be carried around with it. These pinions, which arearranged with relation to each other as shown in Fig. 3, may beconnected to the bracket in any manner found best adapted to thepurpose, and any changes as would come within ordinary mechanical skillin the construction of the boring-machine I reserve the right to makewithout departing from the principle of my invention. A sleeve IIencircles the shaft A, and the screw -rod B passes down through ascrew-threaded hole in the sleeve, the screw-threads thereof engagingwith the threads of the rod, so that when the rod is turned the sleevewill be fed downward on the shaft, said sleeve carrying the cutter I.The upper end of the shaft A is provided with a head K, having therein arectangular slot d, in which is located a sliding block L, theadjustment of this block being regulated by the adj Listing-screws e,which pass through screw-holes in the ends of the head K, and

the ends of the screws abut against the ends -of the block. v To thehead K is connected a suitable clutch M by means of a bolt f, whichpasses through the clutch and through a hole g in the block L, and thisclutch in turn is connected to the shaft Nof a drill-press or othermachine or mechanism that will impart a rotary motion to theboring-shaft A. In the present instance I have shown the clutch as beingconnected to the shaft N by means of a wedge or key 7L; but it isevident that any well-known means may be employed and any suitable formand construction of clutch may be substituted for that shown, so long asit will admit of the proper adjustment of the shaft A by means of theadjusting-screws e and block g.

As will be noticed, the head K is provided with a scale, as shown at i,to enable the block L to be adj ust-ed to a fraction of an inch,according to the size and taper of the hold desired, this being done bymoving the block away from the center of axis of the shaft (through themedium of the screws e) to one side, so that the axis of the shaftAwillbe on a different vertical plane with the shaft N. This adjustment ofthe shaft A will cause the same to describe a circle in its rotarymovement that will be greater than the diameter of the shaft itself, thecircle being greaterat the upper end of the shaft than at the lower end,and a Very slight adjustment of the shaft A with relation to the axis ofthe shaft N will produce a very marked increase in the circle describedby the cutter I when the shaft is rotated. By this adjustment thediameter of IOO the hole to be bored and also the taper thereof may beregulated and controlled at pleasure, and with the means hereindescribed a very nice and perfect adjustment can be attained with littleor no trouble to the attendant.

The means employed for imparting to the cutter an automatic feed is bothsimple and eective and most reliable in its action.

In order to operate the trip-wheel or device F, a rod is necessary,which I have shown in dotted lines, Fig. 2. This rod is connected to anystationary object-such as the frame of the drill-press--used to impartmotion tothe boring-shaft, and extends down on the same vertical lineWith the fingers 7c of the tri p-Wheel or device F. Now, as the shaft Arevolves the lingers as they come in contact with the hanger-rod willcause the trip device to turn, and with it the pinion E, which pinion,gearing with the intermediate pinion D, will impart motion thereto, andin turn motion will be imparted to the pinion C. This last-mentionedpinion engaging with the upper end of the screw-shaft B will cause theshaft to turn upon its aXis and feed the sleeve II down- Ward at eachquarter-revolution of the shaft A or as each finger of the trip devicecomes in contact withthe hanger-rod the feeding, as above described,continuing during the entire process of boring.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is-

1. In a metal-boring machine, the combination, with the boring-shaft anda clutch device for'attachment to a driving shaft or spindle, of anintermediate mechanism for changing the axis of the boring-shaft withrelation to that of the driving shaft or spindle, substantially as andfor the purpose set forth.

2. In a metal-boring machine, the combination, with the boring-shaft anda clutch de- Vice for attachment to a driving shaft or spindle, of anadjusting mechanism between the boring-shaft and clutch deviceconsisting of a sliding block, to which the clutch device is attached,and adjusting-screws for changing the position of said block,substantially as and for the purpose specified.

3. In a metal-boring machine, the combination, with a clutch device andboring-shaft, of a slotted head thereto, a block adjustable within theslot, and adj listing-screws for adj usting and holding the block in itsadjusted position, substantially as and for the purpose described.

4. In a metal-boring machine, the combination of the boring-shaft, afeed screw-rod, aA sleeve carrying the cutter and engaging therewith,and a trip device for rotating the screw-rod, substantially as and forthe purpose set forth.

5. In a metal-boring machine, a boring-shaft and a sleeve carrying thecutter and encircling said shaft, of a feed screw-rod engaging thesleeve, and a trip device consisting of a wheel with fingers, and a setof pinions engaging with the screw-rod and operating substantially asand for the purpose described.

In testimony that I claim the above I have hereunto subscribed my nainein the presence of two Witnesses.

AVA TATEM. Witnesses:

ALFoNso MERCER, F. E. NoTTiNGHAM.

